PDF malware analysis — malicious · ed78357f607a0fbc

MALICIOUS

PDF

4.2 KB

MD5: e400952083905b419b84f980a769e89c SHA-1: 169c765c9651ecf2f74f0f7e6273de0a5b1865f2 SHA-256: ed78357f607a0fbc6010ffa3e1509f76055665e2933a3734d804ff259e0952d8

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, which is obfuscated and utilizes eval() and String.fromCharCode(). The critical CVE-2008-2992 heuristic indicates the exploitation of a known vulnerability in PDF viewers. The deobfuscated JavaScript, named 'numeric_charcode_stage_000.js', is likely responsible for downloading and executing a second-stage payload. The exact nature of the payload cannot be determined from the provided evidence.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `3a1dba9099369483e000f24013ac1413fefd9ecf9d869c4cd71e39bea046b854`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21471 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `193ed0ceac52efa13d892bf12badadc628a97e8ee303d83f3a80ffb64ccb7486`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6339 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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